If you can provide the where you saw "DSmowmp4"—such as a file extension , a string within a program , or a web search —I can better investigate what it might be.
It could be a specific, proprietary filename generated by a niche piece of software or an internal system, often seen in custom data exports. Recommendations for Further Investigation: DSmowmp4
Security databases do not list "DSmowmp4" as a known virus, ransomware, or malicious script. If you can provide the where you saw